PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Fossil extraction. Technician pouring acid into a beaker containing a rock sample. This technique is used to extract silica fossils from limestone (calcium carbonate). Acid reacts with the limestone and dissolves it, leaving the fossil intact. After the limestone has dissolved, the sample is bathed in an alkili and washed in water. It can then be examined in closer detail. Photographed at the Geosciences Laboratory at the University of Rennes, France.
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